A camera generates a main image and a sub image of which data size is smaller than that of the main image, and stores them in association with an image ID. The camera transmits the image ID and the sub image to a tablet device, and transmits the image ID and the main image to the PC. The tablet device executes a development process on the sub image and generates an adjustment value, and transmits the adjustment value together with the image ID to a server. The PC receives the adjustment value based on the image ID from the server and uses the adjustment value for a development process on the main image.